Avinash's income = Rs. 12000
Avinash's wife income = Rs. 15000
Total income = 12000 + 15000 = Rs. 27000
(i) Ratio of Avinash's income to the income of his wife = 12000 : 15000 = 4 : 5
(ii) Ratio of Avinash's income to their total income = 12000 : 27000 = 4 : 9